Create a green environment, improving energy use, the concept of "green light" is now widely recognized. With the advancement of technology, the rapid development of semiconductor materials application technology, low power LED lighting landscape lighting has been widely used in high-power LED lamps are more and more aroused concerns.
High-power LED street light is a light emitting diode group achieved through a new way of lighting low voltage dc lighting needs, with high brightness, good color and other characteristics; addition, because the LED lights to low voltage DC input, with the solar combine to make solar LED lights has become a possibility in the future of road lighting the way.
1, on the energy efficiency analysis, comparison
Should follow to achieve the same illuminance (brightness) levels, compare the lighting installed near the power under the premise of lighting quality standards. As the high pressure sodium lamp power (250 ~ 400W) high luminous efficiency, up to 130 ~ 1401m / W, while the low-power lamps (100 ~ 150W) luminous efficiency of about 80 ~ 1001m / W, while the active power LED Streetlights multi 1WLED tube light effects are similar, so should the small high-power lights were on power streetlights for analysis.
(1) high-power (≥ 250W) Street Light: High pressure sodium lighting efficiency, consider three factors ballast losses, lighting efficiency and optical channel utilization, etc., if the overall efficiency by 0.55 meter, the effective optical efficiency of about sodium 70 ~ 751m / W; effective luminous efficiency LED lights, in the United States is about 621m / W, the best domestic enterprises has reached 56 ~ 581m / W. Thus, the town Runjing streetlights think for high-power lights, the current energy efficiency of LED sodium than the lower.
(2) low power (≤ 150W) streetlights: effective optical efficiency sodium lamp (included in the overall efficiency of 0.55) is about 45 ~ 551m / W, while LED based upon 56 ~ 581m / W total, the ratio of sodium to achieve energy-saving LED 10 % to 20%, up to 30%. From the analysis, it was found to slip small power (≤ 150W) when, LED lights up to 10% to 30% energy saving over sodium lamp, but still not as high-pressure sodium lamps for energy efficiency.
2, analysis of the light source color lighting effects on road
HPS correlated color temperature (Tcp) is about 2100K, is a warm color temperature, color rendering index (Ra) is only 23 to 25, the color is low; while the color temperature LED lights are now used much at 5300K, the color temperature is cold, better The product, which can reach 70 to 80 Ra, the color is good. As a vehicle traveling fast road, main road, partial ** sodium light, to see the road in front of about 90 ~ 160m distance condition, slightly better results than white light, especially on a foggy, dusty air conditions, Sodium more advantages. For sidewalks, pedestrianized street, residential area, such as roads, LED color rendering than sodium, tell people the situation clearer, more advantages.
3, comparative economic analysis
High-pressure sodium lamps, each of about 1200 ~ 1500 yuan; present LED lights, according to the power of different sizes, the price difference between the larger, about 4,000 to 8,000 yuan. The present situation is concerned, LED lights clearly too expensive, the price of up to 3 to 5 times the giant. As previously? Less than 150W of LED can save 10% to 30% per year per lamp saving about 50 ~ 150KWh, simply can not spend more than the cost of recovering the share of light. Can only hope that in the coming years, LED development trend of its price will gradually decline, to further improve energy efficiency, and then compare their economic performance.
4, life analysis
Comparison should be based on the life of the whole lamp life. HPS include lighting, electrical accessories (mainly ballast, trigger) and lamps, sodium lamps for street lights average life expectancy of 3 to 5 years, energy-saving ballasts not less than 20 years, lighting as well. The LED lights no life experience, existing enterprise known as 50000, 60000 hours, there is no reliable basis. Developed by the U.S. Energy Star requirements are divided into two tranches of not less than 35000h and 25000h mainly LED chip life is very long, but the relationship between the encapsulated temperature, heat and other factors greatly, in addition to an electronic circuit device driver Component life issues, such as capacitors often only 8000h to 10000h. So overall, said, LED lamp life and sodium lamps can not match.
5, to maintain the performance comparison
In the city street department, represented by the user, are more concerned about street maintenance performance. By analysis of sodium to maintain good performance, as long as lamps scrub, do not replace, little ballast replacement, lighting replaced every 3 to 5 years, is also very convenient. And LED lights, LED involving tube modules (including lenses, etc.), power devices, components occurs, the larger the possibility of component damage, there are difficulties in maintenance and replacement, it is possible to replace the whole, higher cost, and to be in the future resolved. LED lights are also no standard to follow, for bidding, ordering, use, maintenance, are negative.